新型混凝剂聚合氯化铝钛的制备及性能表征
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摘要
在传统聚合氯化铝(PAC)中加入钛盐制备了新型聚合氯化铝钛(PATC)混凝剂,通过ζ电位、粒径、红外和扫描电镜等表征手段与传统PAC进行了对比,并使用2种混凝剂针对西安兴庆湖原水进行了混凝实验。结果表明,经过钛盐改性的PATC的粒径和ζ电位(126.3 nm、28.29 mV)较PAC的粒径和ζ电位(16.72 nm、8.257 mV)有一定的提升,这使得其具有更高的电中和和网捕卷扫能力。同时PATC相比PAC具有更宽的pH适应范围,在整个pH范围内(5～9)均具有更强的电中和能力。在原水混凝实验中,经过钛盐改性的PATC相比于PAC,对微生物代谢产物和蛋白质类有机物的去除能力提高(去除率分别提高了6.9%与7.1%)。
A new type of PATC coagulant was prepared by adding titanium salt to traditional PAC coagulant in this experiment, and compared with the traditional PAC throuth ζ potential, coagulant size, FI TR and SEM, etc. At the same time, the raw water coagulation experiments by two kinds of coagulant were also conducted. The results showed that the titanium salt modified PATC had larger particle size and zeta potential(126.3 nm, 28.29 mV) than PAC(16.72 nm, 8.257 mV), which makes it had higher electric neutralization and sweep capacity. In addition, PATC had a wider effective range of pH than PAC, and had stronger electric neutralization ability throughout the entire pH range(5～9). In the raw water coagulation experiments, the titanium saltmodified PATC increased the removal efficiency of microbial metabolites and protein-liked organic matters compared with PAC, the removal rate increased by 6.9% and 7.1% respectively.
A new type of PATC coagulant was prepared by adding titanium salt to traditional PAC coagulant in this experiment, and compared with the traditional PAC throuth ζ potential, coagulant size, FI TR and SEM, etc. At the same time, the raw water coagulation experiments by two kinds of coagulant were also conducted. The results showed that the titanium salt modified PATC had larger particle size and zeta potential(126.3 nm, 28.29 mV) than PAC(16.72 nm, 8.257 mV), which makes it had higher electric neutralization and sweep capacity. In addition, PATC had a wider effective range of pH than PAC, and had stronger electric neutralization ability throughout the entire pH range(5～9). In the raw water coagulation experiments, the titanium saltmodified PATC increased the removal efficiency of microbial metabolites and protein-liked organic matters compared with PAC, the removal rate increased by 6.9% and 7.1% respectively.
引文
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[11]ZHAO Y X,GAO B Y,ZHANG G Z,et al.Comparative study of floc characteristics with titanium tetrachloride against conventional coagulants:Effect of coagulant dose,solution p H,shear force and break-up period[J].Chemical Engineering Journal,2013,233(11):70-79.
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[13]JARVIS P,JEFFERSON B,PARSONS S A.Breakage,regrowth,and fractal nature of natural organic matter flocs[J].Environmental Science and Technology,2005,39(7):2307-2314.
[14]DUAN J M,J GREGORY.Coagulation by hydrolysing metal salts[J].Advances in Colloid and Interface Science,2003,100/102(2):475-502.
[15]TANG H,WANG D,XIAO F,Speciation,stability,and coagulation mechanisms of hydroxyl aluminum clusters formed by PACl and alum:A critical review[J].Advances in Colloid and Interface Science,2015,226:78-85.
[16]CHEN W,WESTERHOFF P,LEENHEERET J A,et al.Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J].Environmental Science and Technology,2003,37(24):5701-5710.
[2]DUAN J,WANG J,GUO T,et al.Zeta potentials and sizes of aluminum salt precipitates-Effect of anions and organics and implications for coagulation mechanisms[J].Journal of Water Process Engineering2014,4:224-232.
[3]徐磊,俞文正,梁亮,等.天然有机物对混凝效果影响机制及絮体特性分析[J].环境科学,2013,34(11):4290-4294.
[4]GANG C,YAN L I,JING L.Coagulation/biological microelectrolysis contact oxidation process for treatment of compressor production wastewater[J].China Water&Wastewater,2007,147(1):95-100.
[5]张大为,徐慧,王希,等.藻形态及混凝剂组成对混凝-超滤过程的影响[J].环境科学2017,38(8):3281-3289.
[6]李肖,李伟,段晋明.聚硅酸钛制备及其助凝特性[J].环境工程学报,2015,9(5):2207-2212.
[7]DU Y J,CAO B D,ZHANG W J,et al.Improvement of wastewater sludge dewatering properties using polymeric aluminum-silicon complex flocculants conditioning:Importance of aluminum/silicon ratio[J].Colloids and Surfaces A Physicochemical and Engineering Aspects,2017,530:134-145.
[8]郑怀礼,刘克万,龙腾锐,等.聚合氯化铝铁(PAFC)絮凝剂污水除磷的研究[J].环境化学,2005,24(6):693-695.
[9]城镇污水处理厂污染物排放标准:GB 18918-2002[S].
[10]张智,李淼,张超,等.疏松型聚合氯化铝铁的合成与絮凝效果[J].中国给水排水,2014,30(17):66-69.
[11]ZHAO Y X,GAO B Y,ZHANG G Z,et al.Comparative study of floc characteristics with titanium tetrachloride against conventional coagulants:Effect of coagulant dose,solution p H,shear force and break-up period[J].Chemical Engineering Journal,2013,233(11):70-79.
[12]JIAO R Y,XU H,XU W Y,et al.Influence of coagulation mechanisms on the residual aluminum-The roles of coagulant species and MWof organic matter[J].Journal of Hazardous Materials,2015,290:16-25.
[13]JARVIS P,JEFFERSON B,PARSONS S A.Breakage,regrowth,and fractal nature of natural organic matter flocs[J].Environmental Science and Technology,2005,39(7):2307-2314.
[14]DUAN J M,J GREGORY.Coagulation by hydrolysing metal salts[J].Advances in Colloid and Interface Science,2003,100/102(2):475-502.
[15]TANG H,WANG D,XIAO F,Speciation,stability,and coagulation mechanisms of hydroxyl aluminum clusters formed by PACl and alum:A critical review[J].Advances in Colloid and Interface Science,2015,226:78-85.
[16]CHEN W,WESTERHOFF P,LEENHEERET J A,et al.Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J].Environmental Science and Technology,2003,37(24):5701-5710.
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